isequal method for numbers

    /// <summary>
        /// The following method compares any 2 objects and test if they are equal.
        /// It will also compare equality of numbers in a very special way.
        /// Examples:
        ///    isequal(Int64.MaxValue, Int64.MaxValue) //is true
        ///    isequal(Int64.MaxValue, Int64.MaxValue-1) //is false
        ///    isequal(123, 123.0) //is true
        ///    isequal(654f, 654d) //is true
        /// </summary>
    public bool isequal(object a, object b)
        {
            if (a == null && b == null) //both are null
                return true;
            if (a == null || b == null) //one is null, the other isn't
                return false;

            if (IsNumber(a) && IsNumber(b))
            {
                if (isFloatingPoint(a) || isFloatingPoint(b))
                {
                    double da, db;
                    if (Double.TryParse(a.ToString(), out da) && Double.TryParse(b.ToString(), out db))
                        return Math.Abs(da - db) < 0.000001;
                }
                else
                {
                    if (a.ToString().StartsWith("-") || b.ToString().StartsWith("-"))
                        return Convert.ToInt64(a) == Convert.ToInt64(b);
                    else
                        return Convert.ToUInt64(a) == Convert.ToUInt64(b);
                }
            }

            return a.Equals(b);
        }

        private bool isFloatingPoint(object value)
        {
            if (value is float) return true;
            if (value is double) return true;
            if (value is decimal) return true;
            return false;
        }

        private bool IsNumber(object value)
        {
            if (value is sbyte) return true;
            if (value is byte) return true;
            if (value is short) return true;
            if (value is ushort) return true;
            if (value is int) return true;
            if (value is uint) return true;
            if (value is long) return true;
            if (value is ulong) return true;
            if (value is float) return true;
            if (value is double) return true;
            if (value is decimal) return true;
            return false;
        }